/*
 * Copyright 2021 DataCanvas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.dingodb.common.mysql.client;

import java.util.Observable;

public class SessionVariableWatched extends Observable {
    private static SessionVariableWatched instance = null;

    public void notifyObservers(Object arg) {

        super.setChanged();

        super.notifyObservers(arg);

    }

    public static SessionVariableWatched getInstance() {
        if (instance == null) {
            synchronized (SessionVariableWatched.class) {
                if (instance == null) {
                    instance = new SessionVariableWatched();
                }
            }
        }
        return instance;
    }
}
